%I A043880
%S A043880 4,20,33,36,49,52,84,97,100,113,116,129,135,148,161,164,177,180,
%T A043880 193,199,212,225,228,241,244,340,353,356,369,372,385,391,404,
%U A043880 417,420,433,436,449,455,468,481,484,497,500,513,519,543,545
%N A043880 Numbers n such that 0 and 1 occur juxtaposed in the base 4 representation 
               of n but not of n+1.
%Y A043880 Sequence in context: A097251 A079454 A115428 this_sequence A030002 A085805 
               A119413
%Y A043880 Adjacent sequences: A043877 A043878 A043879 this_sequence A043881 A043882 
               A043883
%K A043880 nonn,base
%O A043880 1,1
%A A043880 Clark Kimberling (ck6(AT)evansville.edu)